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Cybercriminals have stolen payment card data from six more U.S. retailers using similar point-of-sale malware that compromised Target, a computer crime intelligence company said Friday.

The conclusion comes from a study of members-only forums where cybercriminals buy and sell data and malicious software tools, said Dan Clements[cq], president of IntelCrawler, which conducted the analysis.

The retailers have not been publicly named, but IntelCrawler is providing technical information related to the breaches to law enforcement, Clements said in a telephone interview Friday.

IntelCrawler has also identified a 17-year-old Russian who it says created the BlackPOS malware, which intercepts unencrypted payment card data after a card is swiped. Security experts believe malware based on BlackPOS was used against Target.

The teenager, who goes by the online nickname "ree4," sold more than 40 copies of BlackPOS to cybercriminals in Eastern Europe and elsewhere, according to forum postings IntelCrawler analyzed.

Clements said IntelCrawler is "90 percent" sure of its finding, based on the forum postings and sources it communicated with.

The forum posts indicate the teenager sold the malware for US$2,000 or for a share of the profits that came from monetizing stolen payment card details, Clements said.

BlackPOS was also sold to "carding" websites such as .rescator, Track2.name and Privateservices.biz that trade in stolen card details, according to IntelCrawler.

BlackPOS was originally called Kaptoxa, which is Russian slang for potato. Clements said the Russian teenager eventually renamed the malware BlackPOS during a fresh marketing push.

Dallas-based security company iSight Partners wrote in a report earlier this week on the Target hack, which it called the "Kaptoxa operation." It says the hackers used a high level of skill to gain stealthy access to the retailer's network.

Since early 2013, IntelCrawler has seen a brisk trade in login credentials for POS terminals on underground forums, suggesting cybercriminals are still finding gaps in industry security recommendations for how payment card data is handled.

Cybercriminals were selling "remote desktop protocol" credentials for POS terminals, which would allow them access to the machines, Clements said.

In many cases, default passwords had not been changed on the terminals, which were located in the U.S., Australia and Canada, he said. In other cases, cybercriminals were successfully trying many combinations of usernames and passwords to find the right one, known as a brute-force attack.